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Yamada has developed an oil pump that can change the capacity of both internal and external rotary drum pumps
At the 40th Tokyo Motor Show (open from October 27 to November 11, 2007, the Yamada Works Co., Ltd. is open to the public), Yamada Works exhibited two internal and external Trochoid pumps housed in a single housing that can be stopped as needed One of the variable-volume pumps. The oil pump forms teeth on the three sets of rotors and forms a rotary line pump through meshing of the teeth. Among the three sets of rotors, the innermost inner rotor, which is the innermost, forms teeth on the outside of the shaft, thereby forming a rotary power input shaft. In the rotor on both sides of the formation of teeth, both inside and outside the folder between the rotation. The outer rotor forms teeth on the inner side, the outer side is circular on one side, and the inner side of the housing is rotated. A main pump is formed in a space sandwiched by the inner rotor and the intermediate rotor, and a portion sandwiched between the intermediate rotor and the outer rotor forms a sub-pump. When the engine rotates at a low speed, the main pump and the auxiliary pump are arranged in parallel and the flow rate is relatively large. After turning into a high speed, when the flow is too large, the outlet of the sub-pump will be switched by the slide valve to return the oil to the oil pan. Trial product of the main and vice pump capacity of 1 to 1. Can be halved as needed. The ratio is free to decide. In the recently introduced engine, variable valve timing and other institutions need to continue to increase oil pressure, idle oil pressure required to become larger. If you design a pump for the purpose of compensating for the shortage of oil pressure during idling, the displacement pump will have a flow rate that increases proportionally with the rotation speed, so the flow will tend to be excessive at high speeds. As a solution to the problem of variable-capacity pump, had previously been designed side by side two small pumps. However, to achieve this solution, the number of rotors and seals and other components are increased to twice the number of the past, the structure is very complicated, the loss is also very serious. The combination of internal and external programs, the rotor can be used both inside and outside, to achieve no waste of design. In the case of a larger diameter spinning pump, the dead zone is easily created at the center, so space utilization can be increased by incorporating another small diameter spinning pump. Trial products to the chain drive, equipped with a lower position than the crankshaft, no acceleration and deceleration demonstration. Actually acceleration and deceleration can also be directly driven by the crankshaft.